someone who believes that the world is going to end in the next ten or so years due to "Climate Change".
Greta: "How dare you, you stole my future".
Hansel: "Shut-up Greta, you uneducated thuntard."

Alexandria: "Oh no! The World is going to end in 12 years. Orange man bad."
Pepe: "Here we go again. How did a complete thuntard like her get elected to Congress?"
by RoverIAC October 1, 2019
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